秦岭陡坡—岩溶发育区耦合作用下高速公路桥梁桩基础稳定性研究

A Study on Stability of Bridge Pile Foundation of Expressway Under the Coupling Action of Qinling Steep Slope and Karst Development Area

为了研究秦岭山区陡坡—岩溶发育区耦合作用下高速公路桥梁桩基础的稳定性,以实际工程十天高速公路(略阳—陕甘界段)为背景,采用FLAC3D建立数值仿真模型,分析了秦岭陡坡—岩溶发育区桩基水平承载力。结果表明,溶洞对桩基水平承载力的影响程度大于陡坡。无溶洞、坡度为0°和顶板厚度1.5 m、坡度60°的桩基水平承载力分别为485.00 kN和323.84 kN,降低了33.2%。提出了桩基水平承载力预测公式,为相关类似工程提出借鉴。

In order to study the stability of the bridge pile foundation of expressway in the steep slope�rock-soluble development area in Qinling Mountains,the actual project ten-day highway(Lueyang-Shaanxi-Gansu boundary)was used as the background.The pile foundation level bearing capacity of the rock-soluble development area obtains the following conclusions:the degree of influence of the cave on the bearing capacity of the pile foundation is greater than the steep slope.The pile foundation level with a thickness of 0°and the thickness of the top plate is 1.5 m,and the slope is 60°.485.00 kN and 323.84 kN were reduced by 33.2%.The pile foundation level bearing capacity prediction formula was proposed,and a reference for related similar projects was proposed.